Catching Mummichogs in Salt Marsh?

I haven't been able to find any information on the legality of catching fish like Mummichogs (and similar fish like sheepshead minnows), I know that these species are classed under bait and legal to catch.... but what i don't know is if it is legal to collect in there preferred habitat (salt marshes), If it is legal, i i don't know which marshes are legal to traverse

"All good things must come to an end, but bad things think thats rather dull, so they stick around long after their natural end has come"